The string method uses the motion of the rifle's bolt to actuate the trigger each time; the rifle can be held in one place. The danger is the string activating the trigger before the bolt has closed (locked) completely. The string is acting as an external auto-sear without the normal timing precautions machined into real auto-sears and bolts.

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I don't think that's right . . . most if not all semi-autos have a disconnector so that pulling the trigger won't fire the gun unless the bolt IS closed. It would take some sort of malfunction (wear, broken part, etc.) to fire the gun in an out-of-battery condition by means of a trigger pull.

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